-use crate::utils::is_automatically_derived;
use clippy_utils::diagnostics::span_lint_hir;
use if_chain::if_chain;
use rustc_hir::{Impl, Item, ItemKind};
use rustc_span::sym;
declare_clippy_lint! {
- /// **What it does:** Checks for manual re-implementations of `PartialEq::ne`.
+ /// ### What it does
+ /// Checks for manual re-implementations of `PartialEq::ne`.
///
- /// **Why is this bad?** `PartialEq::ne` is required to always return the
+ /// ### Why is this bad?
+ /// `PartialEq::ne` is required to always return the
/// negated result of `PartialEq::eq`, which is exactly what the default
/// implementation does. Therefore, there should never be any need to
/// re-implement it.
///
- /// **Known problems:** None.
- ///
- /// **Example:**
+ /// ### Example
/// ```rust
/// struct Foo;
///
/// fn ne(&self, other: &Foo) -> bool { !(self == other) }
/// }
/// ```
+ #[clippy::version = "pre 1.29.0"]
pub PARTIALEQ_NE_IMPL,
complexity,
"re-implementing `PartialEq::ne`"
fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'_>) {
if_chain! {
if let ItemKind::Impl(Impl { of_trait: Some(ref trait_ref), items: impl_items, .. }) = item.kind;
- let attrs = cx.tcx.hir().attrs(item.hir_id());
- if !is_automatically_derived(attrs);
+ if !cx.tcx.has_attr(item.def_id.to_def_id(), sym::automatically_derived);
if let Some(eq_trait) = cx.tcx.lang_items().eq_trait();
if trait_ref.path.res.def_id() == eq_trait;
then {
- for impl_item in impl_items {
+ for impl_item in *impl_items {
if impl_item.ident.name == sym::ne {
span_lint_hir(
cx,